servlet(config): add search configuration endpoint

[david-leifker]

Create an endpoint in GMS which will return a csv of the search weights for each entity. Useful for debugging search rankings. A few rows are shown below. The endpoint is exposed on GMS as http://localhost:8080/config/search/export?format=csv or the frontend as http://localhost:8080/api/gms/config/search/export?format=csv

entity	query_category	match_category	query_type	field_name	field_weight	search_analyzer	case_insensitive	query_boost	raw
dataset	relevancy	fulltext	SimpleQueryStringBuilder	urn	10.0	keyword	TRUE	1.0	{  "simple_query_string" : {    "query" : "*",    "fields" : [      "urn^10.0",      "editedDescription^1.0",      "fieldPaths^1.0",      "typeNames^1.0",      "customProperties^1.0",      "qualifiedName^10.0",      "fieldLabels^0.2",      "fieldDescriptions^0.1",      "name^10.0",      "description^1.0",      "editedFieldDescriptions^0.1",      "id^10.0"    ],    "analyzer" : "keyword",    "flags" : -1,    "default_operator" : "and",    "analyze_wildcard" : false,    "auto_generate_synonyms_phrase_query" : true,    "fuzzy_prefix_length" : 0,    "fuzzy_max_expansions" : 50,    "fuzzy_transpositions" : true,    "boost" : 1.0  }}
dataset	relevancy	fulltext	SimpleQueryStringBuilder	editedDescription	1.0	keyword	TRUE	1.0	{  "simple_query_string" : {    "query" : "*",    "fields" : [      "urn^10.0",      "editedDescription^1.0",      "fieldPaths^1.0",      "typeNames^1.0",      "customProperties^1.0",      "qualifiedName^10.0",      "fieldLabels^0.2",      "fieldDescriptions^0.1",      "name^10.0",      "description^1.0",      "editedFieldDescriptions^0.1",      "id^10.0"    ],    "analyzer" : "keyword",    "flags" : -1,    "default_operator" : "and",    "analyze_wildcard" : false,    "auto_generate_synonyms_phrase_query" : true,    "fuzzy_prefix_length" : 0,    "fuzzy_max_expansions" : 50,    "fuzzy_transpositions" : true,    "boost" : 1.0  }}
dataset	relevancy	fulltext	SimpleQueryStringBuilder	fieldPaths	1.0	keyword	TRUE	1.0	{  "simple_query_string" : {    "query" : "*",    "fields" : [      "urn^10.0",      "editedDescription^1.0",      "fieldPaths^1.0",      "typeNames^1.0",      "customProperties^1.0",      "qualifiedName^10.0",      "fieldLabels^0.2",      "fieldDescriptions^0.1",      "name^10.0",      "description^1.0",      "editedFieldDescriptions^0.1",      "id^10.0"    ],    "analyzer" : "keyword",    "flags" : -1,    "default_operator" : "and",    "analyze_wildcard" : false,    "auto_generate_synonyms_phrase_query" : true,    "fuzzy_prefix_length" : 0,    "fuzzy_max_expansions" : 50,    "fuzzy_transpositions" : true,    "boost" : 1.0  }}
dataset	relevancy	fulltext	SimpleQueryStringBuilder	typeNames	1.0	keyword	TRUE	1.0	{  "simple_query_string" : {    "query" : "*",    "fields" : [      "urn^10.0",      "editedDescription^1.0",      "fieldPaths^1.0",      "typeNames^1.0",      "customProperties^1.0",      "qualifiedName^10.0",      "fieldLabels^0.2",      "fieldDescriptions^0.1",      "name^10.0",      "description^1.0",      "editedFieldDescriptions^0.1",      "id^10.0"    ],    "analyzer" : "keyword",    "flags" : -1,    "default_operator" : "and",    "analyze_wildcard" : false,    "auto_generate_synonyms_phrase_query" : true,    "fuzzy_prefix_length" : 0,    "fuzzy_max_expansions" : 50,    "fuzzy_transpositions" : true,    "boost" : 1.0  }}
dataset	relevancy	fulltext	SimpleQueryStringBuilder	customProperties	1.0	keyword	TRUE	1.0	{  "simple_query_string" : {    "query" : "*",    "fields" : [      "urn^10.0",      "editedDescription^1.0",      "fieldPaths^1.0",      "typeNames^1.0",      "customProperties^1.0",      "qualifiedName^10.0",      "fieldLabels^0.2",      "fieldDescriptions^0.1",      "name^10.0",      "description^1.0",      "editedFieldDescriptions^0.1",      "id^10.0"    ],    "analyzer" : "keyword",    "flags" : -1,    "default_operator" : "and",    "analyze_wildcard" : false,    "auto_generate_synonyms_phrase_query" : true,    "fuzzy_prefix_length" : 0,    "fuzzy_max_expansions" : 50,    "fuzzy_transpositions" : true,    "boost" : 1.0  }}

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
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[david-leifker]

Pending review of where and how the endpoint should be exposed

[vercel]

Deployment failed with the following error:

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[shirshanka]

LGTM